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Whether a race, special group ride, training opportunity, or cycling-related community event, the 303 calendar showcases it all.  To have an event posted here please follow this link:  Event Policy Submission & Guidelines.

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December 2018

Stocking Run 5k

December 16
Purple Park, 2388 Rock Creek Pkwy
Superior, CO United States
+ Google Map

Superior   Join us on Sunday December 16th for a fun and festive, family-friendly 5K run and walk in the town of Superior - conveniently located off Highway 36 between Denver and Boulder. Get a head start on the holiday season with the Stocking Run!!! All entrants will receive a red felt stocking chock-full of sponsor goodies! How fun is that!!! And stockings for kids age 8 and under will include a tiny toy! This is also the first race in…

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January 2019

Chilly Cheeks Duathlon Series Race #2

January 12, 2019
Cherry Creek Reservoir Denver, CO United States + Google Map

Aurora   Denver's low key, low cost multisport winter series!!! The Chilly Cheeks Winter Duathlon series is composed of three run-bike events at the Cherry Creek Reservoir. We provide a marked and marshaled course, fast & accurate chip timing, light refreshments, and some fun mid-winter competition in the heart of Denver. Enter one race, or all-three - it's up to you. Register for all three duathlons by December 7th and get a pair of Chilly Cheeks Sweat Pants - perfect for pulling…

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Yeti Chase 5k/10k

January 20, 2019
|Recurring Event (See all)

An event every year that begins at 12:00am on day third of January, repeating until January 19, 2025

Bear Creek Lake Park Lakewood, CO United States + Google Map

Morrison   This 5k/10k run is brought to you by Racing Underground. Conveniently located on the scenic west side of metro Denver, Bear Creek Lake Park is known for it's diverse bird and waterfowl population as well as stunning views of the foothills. The 5k and 10k races wander it's 2500 acres with a mostly flat 5K course, while the 10k throws in a few rolling hills. The race has sold out weeks before race day every year, and offers…

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February 2019

Ralston Creek Half Marathon & 5k

February 3, 2019

Arvada   The Ralston Creek Half Marathon and 5K returns in 2019, after sold out fields in the half for the past 7 years! Join us at Colorado's Premier Winter Half Marathon, and the finale to the 2018-2019 Racing Underground winter running series. The Ralston Creek races feature a fun winter half-marathon and 5K run conveniently located on the west side of the Denver Metro Area in Arvada, Colorado. The courses covers a scenic mix of road and bike path…

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Chilly Cheeks Duathon Series Race #3

February 23, 2019
Cherry Creek Reservoir Denver, CO United States + Google Map

Aurora   Denver's low key, low cost multisport winter series!!! The Chilly Cheeks Winter Duathlon series is composed of three run-bike events at the Cherry Creek Reservoir. We provide a marked and marshaled course, fast & accurate chip timing, light refreshments, and some fun mid-winter competition in the heart of Denver. Enter one race, or all-three - it's up to you. Register for all three duathlons by December 7th and get a pair of Chilly Cheeks Sweat Pants - perfect for pulling…

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